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第1题:
请完善程序(程序文件名:Java_3.java)并进行调试。请在下画线处填入正确内容,然后删除下画线。请勿删除注释行和其他已有的语句内容。
[题目要求]
生成下面左边图形界面,单击图中的New按钮,弹出如右图所示的对话框。

源程序:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Java_3 {
public static void main(String[] args) {
MulticastFrame. frame=new MulticastFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.show();
}
}
class MulticastFrame. extends JFrame. {
public MulticastFrame() {
setTitle("MulticastTest");
setSize(WIDTH,HEIGHT);
MulticastPanel panel=new MulticastPanel();
Container contentPane=getContentPane();
contentPane.add( (1) );
}
public static final int WIDTH=300;
public static final int HEIGHT=200;
}
class MulticastPanel extends JPanel }
public MulticastPanel() {
JButton newButton=new JButton("New");
add(newButton);
ActionListener newListener=new ActionListener() {
public void actionPerformed(ActionEvent event) {
makeNewFrame();
}
};
newButton.addActionListener(newListener);
closeAllButton=new JButton("Close all");
add(closeAllButton);
}
private void makeNewFrame() {
final BlankFrame. frame=new BlankFrame();
frame.show();
ActionListener closeAllListener=new ActionListener() {
public void actionPerformed(ActionEvent event) {
frame. (2) (); //使窗口隐藏或消除
}
};
closeAllButton.addActionListener( (3) );
}
private JButton closeAllButton;
}
Class BlankFrame. extends JFrame. {
public BlankFrame() {
(4) ++;
setTitle("Frame"+counter);
setSize(WIDTH,HEIGHT);
setLocation(SPACING*counter,SPACING*counter);
}
public static final int WIDTH=200;
public static final int HEIGHT=150;
public static final int SPACING=30;
private static int counter=0;
}
第2题:
下列哪个成员方法声明是正确的? ( )
A.public abstract final int f(){...}
B.public static boolean f(){...}
C.static protected void g(a,{...}
D.protected private number;
第3题:
现有: class TestMain { static int x = 2; static { x = 4; } static public void main(String[] args) { int y = x + 1; System.out.println(y); } } 和命令行: java TestMain 结果为:()
第4题:
现有: 1.class Passer f 2.static final int X=5; 3.public static void main (String [] args) { 4.new Passer( ).go (x); 5.System. out .print (x); 6. ) 7.void go (int x) { 8.System. out .print(x++); 9.} 10.}结果是什么?()
第5题:
class Passer { static final int x = 5; public static void main(String [] args) { new Passer().go(x); System.out.print(x); } void go(int x) { System.out.print(++x); } } 结果是什么?()
第6题:
现有: class Top { static int x=l; public Top (inty) { x*=3; } } class Middle extends Top { public Middle() {x+=1; ) public static void main (String [] args) { Middle m = new Middle(); System. out .println (x); } } 结果为:()
第7题:
2
3
4
编译失败
第8题:
0
1
3
4
第9题:
s 14
s 16
s 10
Compilation fails.
An exception is thrown at runtime.
第10题:
3
5
编译失败
运行时异常被抛出
第11题:
1
2
3
编译失败
第12题:
7
5
3
2
第13题:
下面的例子中
using System;
class A
{
public static int X;
static A(){
X=B.Y+1;
}
}
class B
{
public static int Y=A.X+1;
static B(){}
static void Main(){
Console.WriteLine("X={0},Y={1}",A.X,B.Y);
}
}
产生的输出结果是什么?
第14题:
下列哪个成员方法声明是正确的? ( )
A.public abstract final int f(){…}
B.public static boolean f(){…}
C.static protected void g(a,b){…}
D.protected private number;
第15题:
interface DeclareStuff{ public static final int EASY = 3; void doStuff(int t); } public class TestDeclare implements DeclareStuff { public static void main(String [] args) { int x=5; new TestDeclare().doStuff(++x); } void doStuff(int s) { s += EASY + ++s; System.out.println(”s “ + s); } } What is the result?()
第16题:
class Top { static int x = 1; public Top(int y) { x *= 3; } } class Middle extends Top { public Middle() { x += 1; } public static void main(String [] args) { Middle m = new Middle(); System.out.println(x); } } 结果为:()
第17题:
Which three form part of correct array declarations?()
第18题:
Which three statements are true?()
第19题:
3
5
编译失败
运行时异常被抛出
第20题:
A final method in class X can be abstract if and only if X is abstract.
A protected method in class X can be overridden by any subclass of X.
A private static method can be called only within other static methods in class X.
A non-static public final method in class X can be overridden in any subclass of X.
A public static method in class X can be called by a subclass of X without explicitly referencing the class X.
A method with the same signature as a private final method in class X can be implemented in a subclass of X.
A protected method in class X can be overridden by a subclass of X only if the subclass is in the same package as X.
第21题:
55
56
65
66
第22题:
55
56
65
66
第23题:
X
y
j
i
第24题:
x
y
i
j